Question

3. A window is in the form of a trapezium whose parallel sides are 110cm and 70cm respectively and the distance between the parallel is 60cm. Find the cost of the glass used to cover the window at the rate of Rs 3 per sq.cm.​

Answer 1

Answer:

Given the parallel sides a = 110 cm; b = 70 cm;

Height = 60 cm

Area of the trapezium = 1/2 x h x (a + b) sq. units

= 1/2 x 60 x (110 + 70) cm2 = 30 x 180 cm2 = 5400 cm2

For 1 cm2 cost of glass used = Rs 3 ∴ For 5400 cm2 cost of glass = Rs 5400 x 3 = Rs 16200

Cost of the glass used = Rs 16200

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Answer 2

Given parallel sides a = 110 and b= 70

parralel = a*b =110*70= 1170

cover area= 3 per sq .cm

trapezium = 1/2 ( a+b)

=1/2 ( 110+70 )

1/2(180)

1 (90) =90

cost of the glass used to cover the window at the rate of Rs. 3 per sq.cm

90*3=270