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a crossection of a ruler which is a rectangle of 2.5 cm by 0.2 cm on which is surmounted an isosceles trapezium[one in which the non parallel sides are of equal length]. The shorter of the parallel sides of a trapezium is 0.7 cm long if the greatest height of the ruler is 0.4 cm and it is 33 cm long ,calculate its surface area |
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Answer» AREA =12(sum of parallel sides)× distance between them 12(7x+4x)×2x=176 11x2=176⇒x216 ⇒x=4 AB=7×4=28cm CD=4×4=16cm CM=2×4=8cm AM=AN+NM ⇒AN+16 ⇒6+16=22 (AN=BM=122=6) AC2=CM2+AM2 AC2=82+222 Step-by-step explanation: plzzzz mark broo |
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