find the area of a quadrileteral ,if the lenth of one of its diagonal is 70cm and the perpendicular distance from two opposite vertices to this diagonal are 40cm and 20cm
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Area = 1/2×40×70+1/2×20×70
= 20×70+10×70
1400+700
= 2100 cm²
= 20×70+10×70
1400+700
= 2100 cm²
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