Question

find the sum of the length of parallel side of a trapezium whose area is 4.2 sq.m and height is 280 cm.​

Answer 1

Answer:

given

area=4.2sq.m

height=280

sum of parallel side=x

to find: sum of parallel side

solution,

area of trapezium=1/2( sum of the parallel side)×height

4.2 =1/2× (x) ×280

4.2=140x

x=140/4.2

x=33.3

Answer 2

Answer:

the sum of length of parallel sides of a trapezium is 3 meters.

Step-by-step explanation:

let the sum of (a+b) = x say

area of trapezium = 1/2×h(a+b)

given height = 280 cm (280/100=2.8 meters)

area of trapezium =4.2 sq.meters

area of trapezium = 1/2×h(a+b)

4.2=1/2×2.8(x)

4.2 = 1.4 (x)

4.2/1.4 = x

x = 3 meters

therefore the sum of length of parallel sides of a trapezium = 3 meters