1.

an umbrella is made by stitching ten triangular pieces of cloth , each measuring 25 cm , 17 cm ,12 cm . find the cost Of total cloth required ,if 1 cm2 costs 20​

Answer»

Answer:

Step-by-step explanation:

for 1 umbrella the cloth is required = area of a TRIANGLE

area of SCALENE triangle= √s(s-a)(s-b)(s-c)

s=a+b+c/2

s=25+17+12/2

s=54/2

s=27

area= √27(2)(10)(15)

area= √8100

A= 90 cm²

for 1 triangle= 90cm²

for 10 triangles= 900cm²

the cost of cloth= 20/cm²

for 900cm²=900×20=18000rs

hope you understand

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