Cộng Số đo Góc, Góc Kề Nhau, Góc Phụ Nhau, Góc Bù Nhau

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Cộng số đo góc, góc kề nhau, góc phụ nhau, góc bù nhau

1. Tính chất cộng số đo hai góc

Nếu tia

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nằm giữa hai tia

<img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-83d263bdb6449379a43a53d7d5a6846e_l3.png" alt="Ox" title="Rendered by QuickLaTeX.com" height="12" width="24" style="vertical-align: 0px;"><noscript><img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-83d263bdb6449379a43a53d7d5a6846e_l3.png" alt="Ox" title="Rendered by QuickLaTeX.com" height="12" width="24" style="vertical-align: 0px;"><noscript><img decoding="async" src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-83d263bdb6449379a43a53d7d5a6846e_l3.png" alt="Ox" title="Rendered by QuickLaTeX.com" height="12" width="24" style="vertical-align: 0px;">

và

<img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;">

thì

$\displaystyle \widehat{xOy}+\widehat{yOz}=\widehat{xOz}$ Cộng số đo góc, góc kề nhau, góc phụ nhau, góc bù nhau Ngược lại, nếu $\displaystyle \widehat{xOy}+\widehat{yOz}=\widehat{xOz}$ thì tia

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nằm giữa hai tia

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và

<img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;">

.

*Lưu ý:

a) Ta có thể dùng mệnh đề tương đương sau với tính chất trên:

Nếu $\displaystyle \widehat{xOy}+\widehat{yOz}\ne \widehat{xOz}$ thì tia

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không nằm giữa hai tia

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và

<img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;">

.

b) Cộng liên tiếp. Nếu tia

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nằm giữa hai tia

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và

; tia

<img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;"><noscript><img decoding="async" src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-897da5de467356e60ee75a184c63d26f_l3.png" alt="Oz" title="Rendered by QuickLaTeX.com" height="12" width="23" style="vertical-align: 0px;">

nằm giữa hai tia

<img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-64412b6e9ab1be183bade754dbe140c3_l3.png" alt="Oy" title="Rendered by QuickLaTeX.com" height="16" width="23" style="vertical-align: -4px;"><noscript><img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-64412b6e9ab1be183bade754dbe140c3_l3.png" alt="Oy" title="Rendered by QuickLaTeX.com" height="16" width="23" style="vertical-align: -4px;"><noscript><img decoding="async" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-64412b6e9ab1be183bade754dbe140c3_l3.png" alt="Oy" title="Rendered by QuickLaTeX.com" height="16" width="23" style="vertical-align: -4px;"><noscript><img decoding="async" src="http://abcdonline.vn/wp-content/ql-cache/quicklatex.com-64412b6e9ab1be183bade754dbe140c3_l3.png" alt="Oy" title="Rendered by QuickLaTeX.com" height="16" width="23" style="vertical-align: -4px;">

và

thì:

$\displaystyle \widehat{xOy}+\widehat{yOz}+\widehat{tOz}=\widehat{xOt}$ Cộng số đo góc, góc kề nhau, góc phụ nhau, góc bù nhau

2. Hai góc kề nhau, phụ nhau, bù nhau

– Hai góc kề nhau là hai góc có một cạnh chung và hai cạnh còn lại nằm trên hai nữa mặt phẳng đối nhau bờ chứa cạnh chung.

– Hai góc phụ nhau là hai góc có tông số đo bằng

– Hai góc bù nhau là hai góc có tổng số đo bằng

*Lưu ý:

a) Hai góc kề bù là hai góc vừa kề nhau vừa bù nhau. Hai góc kề bù có tổng số đo bằng

b) Hai góc cùng phụ (hoặc cùng bù) với một góc thứ thì bằng nhau.

Hình học 6 - Tags: góc bù nhau, góc kề nhau, góc phụ nhau, số đo góc, toán 6

Điểm. Đường thẳng. Tia. Đoạn thẳng
Tóm tắt lý thuyết Hình học THCS lớp 6, 7, 8, 9
Lý thuyết Hình học lớp 6 cần nhớ

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