Câu 1: Trang 56 - sách giáo khoa (SGK) Toán tiếng anh lớp 4:List the right angles, sharp corners,...

In the sixth image, there are four right angles, one sharp corner, no obtuse angles, and no flat angles.

In the fifth image, there are three right angles, no sharp corners, no obtuse angles, and one flat angle.

In the fourth image, there are two right angles, one sharp corner, one obtuse angle, and no flat angles.

In the third image, there are three right angles, two sharp corners, no obtuse angles, and no flat angles.

In the second image, there are two right angles, three sharp corners, no obtuse angles, and no flat angles.