80 just add 22+31+18+9=80
Answer:
Height = 3.5cm.
Step-by-step explanation:
Area of a trapezium:
a+b/2 × h
Area = 14.7cm²
Parallel sides (a and b) = 5.3cm, 3.1cm
14.7cm² = 5.3 + 3.1/2 × h
h = 14.7 ÷ 4.2
h = 3.5cm
The height is 3.5cm.
Answer:
Step-by-step explanation:
7.84 = 8.