Đề kiểm tra 15 phút Toán 6 học kỳ 2 chương 2: Góc (đề 3)

Chủ nhật - 10/03/2019 01:23
Đề kiểm tra 15 phút Toán 6 học kỳ 2 chương 2: Góc (đề 3) có đáp án kèm theo. Mời các bạn cùng tham khảo.

Bài 1. Vẽ tam giác ABC, điểm D thuộc cạnh AC. Nối B với D.

a) Đoạn thẳng BD là cạnh chung của những tam giác nào?

b) Góc C là góc chung của những tam giác nào?

Bài 2. Cho hai góc kề bù xOz và zOy; biết ∠xOz = 100o. Chứng tỏ rằng ∠zOy = 4/5 ∠xOz

ĐÁP ÁN

Bài 1.

Đề kiểm tra Toán 6 | Đề thi Toán 6









a) Đoạn thẳng BD là cạnh chung của các tam giác BDA, BDC.

b) Góc C là góc chung của các tam giác CBD, CBA.

Bài 2.

Đề kiểm tra Toán 6 | Đề thi Toán 6







Ta có: ∠xOz và ∠zOy là hai góc kề bù, do đó:

∠xOz + ∠zOy = 180o

100o + zOy = 180o

∠zOy = 180o - 100o

∠zOy = 80o

Đề kiểm tra Toán 6 | Đề thi Toán 6

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