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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
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