# Area of triangles and quadrilaterals

> Grade 7: area of a triangle = half base x height, area of a parallelogram, area of a trapezium, area of compound shapes, units of area (cm squared, m squared).

Source: https://olyclass.com/library/math-g7-area-triangles-en/

- Subject: Math
- Level: Grade 7
- Practice: 16
- Play it free on one screen (projector, TV or whiteboard): https://olyclass.com/library?play=math-g7-area-triangles-en
- Copy and edit it: https://olyclass.com/library?copy=math-g7-area-triangles-en
- Games it plays well in: [Fishing Pond](https://olyclass.com/classroom-games/fishing-pond/), [Claw Machine](https://olyclass.com/classroom-games/claw-machine/), [Lucky Drop](https://olyclass.com/classroom-games/lucky-drop/), [Mini Golf](https://olyclass.com/classroom-games/mini-golf/)

## Questions

1. A triangle has base 10 cm and height 6 cm. What is its area? (16 cm² / 30 cm² / 36 cm² / 60 cm²)
   Answer: 30 cm²
2. A triangle has base 8 m and height 5 m. What is its area? (13 m² / 20 m² / 26 m² / 40 m²)
   Answer: 20 m²
3. The area of a triangle is half of base × height.
   Answer: True
4. A triangle has area 24 cm² and base 8 cm. What is its height? (12 cm / 3 cm / 6 cm / 8 cm)
   Answer: 6 cm
5. A parallelogram has base 7 cm and perpendicular height 4 cm. What is its area? (11 cm² / 14 cm² / 22 cm² / 28 cm²)
   Answer: 28 cm²
6. To find a parallelogram's area, multiply the base by the slanted side length.
   Answer: False
7. A parallelogram has area 45 m² and base 9 m. What is its perpendicular height? (10 m / 36 m / 405 m / 5 m)
   Answer: 5 m
8. A trapezium has parallel sides 5 cm and 9 cm, and height 4 cm. What is its area? (18 cm² / 28 cm² / 45 cm² / 56 cm²)
   Answer: 28 cm²
9. A trapezium has parallel sides 6 m and 10 m and height 3 m. What is its area in m²?
   Answer: 24 m²
10. An L-shape is a 6 cm by 4 cm rectangle joined to a 3 cm by 2 cm rectangle. Total area? (20 cm² / 24 cm² / 30 cm² / 36 cm²)
   Answer: 30 cm²
11. A 10 m by 10 m square has a 4 m by 3 m rectangle cut out. What area is left? (12 m² / 86 m² / 88 m² / 93 m²)
   Answer: 88 m²
12. A rectangle 8 cm by 5 cm has a triangle of base 8 cm and height 5 cm removed. Area left?
   Answer: 20 cm²
13. Which unit is best for measuring the area of a classroom floor? (cm / km / m / m²)
   Answer: m²
14. A square with sides of 1 m has an area of 100 cm².
   Answer: False
15. How many square centimetres are in one square metre?
   Answer: 10 000
16. Which unit is best for the area of a postage stamp? (cm² / km² / m / m²)
   Answer: cm²