Hướng dẫn giải bài tập SGK Toán lớp 3 trang 42: Góc vuông, góc không vuông
Hướng dẫn giải bài tập SGK Toán lớp 3 trang 42: Góc vuông, góc không vuông
Hướng dẫn giải bài góc vuông, góc không vuông (bài 1, 2, 3, 4 SGK Toán lớp 3 trang 42)
Bài 1: (Hướng dẫn giải bài tập số 1 SGK)
a) Dùng eke để kiểm tra góc vuông, sau đó đánh dấu góc vuông như sau:
b) Chấm điểm O, đặt đỉnh góc vuông trùng với đỉnh O, vẽ cạnh OA, OB theo cạnh của eke.
Chấm điểm M, đặt đỉnh góc vuông trùng với đỉnh M, vẽ cạnh MC, MD theo cạnh của eke.
Bài 2: (Hướng dẫn giải bài tập số 2 SGK)
Dùng eke kiểm tra, ta có:
Các góc vuông là:
+ Góc đỉnh A, cạnh AE, AD
+ Góc đỉnh D, cạnh DM, DN
+ Góc đỉnh G, cạnh GX, GY
Các góc không vuông là:
+ Góc đỉnh B, cạnh BH, BG
+ Góc đỉnh C, cạnh CK, CI
+ Góc đỉnh E, cạnh EP, EQ.
Bài 3: (Hướng dẫn giải bài tập số 3 SGK)
Dùng eke kiểm tra ta có:
Góc vuông là:
+ Góc đỉnh M, cạnh MN, MQ.
+ Góc đỉnh Q, cạnh QP, QM.
Các góc không vuông là:
+ Góc đỉnh N, cạnh NM, NP
+ Góc đỉnh P, cạnh PQ, PN.
Bài 4: (Hướng dẫn giải bài tập số 4 SGK)
Khoanh tròn vào D: D. 4.
Bài 1: (Hướng dẫn giải bài tập số 1 SGK)
a) Dùng eke để kiểm tra góc vuông, sau đó đánh dấu góc vuông như sau:
b) Chấm điểm O, đặt đỉnh góc vuông trùng với đỉnh O, vẽ cạnh OA, OB theo cạnh của eke.
Chấm điểm M, đặt đỉnh góc vuông trùng với đỉnh M, vẽ cạnh MC, MD theo cạnh của eke.
Bài 2: (Hướng dẫn giải bài tập số 2 SGK)
Dùng eke kiểm tra, ta có:
Các góc vuông là:
+ Góc đỉnh A, cạnh AE, AD
+ Góc đỉnh D, cạnh DM, DN
+ Góc đỉnh G, cạnh GX, GY
Các góc không vuông là:
+ Góc đỉnh B, cạnh BH, BG
+ Góc đỉnh C, cạnh CK, CI
+ Góc đỉnh E, cạnh EP, EQ.
Bài 3: (Hướng dẫn giải bài tập số 3 SGK)
Dùng eke kiểm tra ta có:
Góc vuông là:
+ Góc đỉnh M, cạnh MN, MQ.
+ Góc đỉnh Q, cạnh QP, QM.
Các góc không vuông là:
+ Góc đỉnh N, cạnh NM, NP
+ Góc đỉnh P, cạnh PQ, PN.
Bài 4: (Hướng dẫn giải bài tập số 4 SGK)
Khoanh tròn vào D: D. 4.
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