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Sagot :

Step-by-step explanation:

area of triangle = area of trapezoid

Area of triangle = 1/2 × b× h

= 1/2 × 21 × 6

= 21 × 3

Area of triangle = 63

Area of trapezoid = 1/2 × h (b1 + b2)

let b1 = x

b2 = 3x

63 = 1/2 × 6 (x + 2x)

63 × 2 = 6× 3x

216 = 18x

x = 216/18

x = 12

therefore , b1 = 12

b2 = 12 × 2 = 24