# Video: KS2-M16 • Paper 3 • Question 7

Here are five angles marked on a grid of squares. Write the letters of the angles that are obtuse. Write the letters of the angles that are acute.

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### Video Transcript

Here are five angles marked on a grid of squares. Write the letters of the angles that are obtuse. Write the letters of the angles that are acute.

The question asks us to find the obtuse angles and the acute angles. Obtuse angles measure more than 90 degrees or more than a right angle but less than a straight line. And acute angles measure less than 90 degrees or less than a right angle. To help work out if the angles on the grid are obtuse or acute, we could mark on 90 degrees and compare this to the size of the angle.

We can see that angle 𝐴 measures less than 90 degrees. So it’s an acute angle. Angle 𝐵 is a right angle. So it’s neither obtuse nor acute. Angle 𝐶 measures more than 90 degrees or more than a right angle. So 𝐶 is an obtuse angle. Angle 𝐷 measures less than 90 degrees. So it’s an acute angle. Angle 𝐸 measures just more than 90 degrees. So it’s obtuse. The obtuse angles are angles 𝐶 and 𝐸. And the acute angles or the angles which measure less than 90 degrees are angles 𝐴 and 𝐷.