Year 7 Maths — Understanding elementary shapes

Classify angles by size, triangles by their sides and their angles, and tell flat shapes from solid ones.

Name: ________________________

Before you start

Four angles, drawn side by side and getting wider as you go. Find out what each one is called.

Acute is under 90°, obtuse is over it, and the straight one is a half turn — 180°, which is why it stopped looking like a corner at all.

1.This triangle has one right angle. Tap the corner where it is.
Write the number of the part.
2.The angles of a triangle add up to 180°. Two of them are 55° and 65°. How big is the third, in degrees?
3.Two right angles side by side make a straight angle. How many degrees is a straight angle?
4.Match each angle to the name for its size.
- 45°
- 90°
- 120°
- 180°
- 300°
- Obtuse
- Right
- Acute
- Straight
- Reflex
5.An angle of 200° is which kind of angle?
- a) Obtuse
- b) Straight
- c) Acute
- d) Reflex
6.A triangle has sides of 5 cm, 5 cm and 8 cm. How many of its sides are equal in length?
7.A full turn is 360° and splits into four equal right angles. How many degrees is one right angle?
8.An angle of 145° is which kind of angle?
- a) Obtuse
- b) Acute
- c) Reflex
- d) Right