Question

find the base of the triangle whose altitude is 20 cm and area is 0.8 m

Answer 1

first convert 0.8 m in cm because the unit should be same
0.8 ×100 = 80cm
1/2base × height = 80cm
1/2×base×20=80
base×10=80
base=80/10
base =8 cm

Answer 2

here is your answer this may help you