How much glass is used to make a triangular prism having base, an isosceles triangle of equal sides 8cm is vertical angle of 30° and length 20cm? with process
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in an isosceles triangle the perpendicular drawn from apex to opposite side bisects opposite side and bisects apex angle too . so angle is 30/2 =15deg .Altitude of triangle =8cos 15= 8*0.9659=7.7274 cm
half base =8sin15 =8*0.2588 =2.0706 base =2 *2.0706 =4.1412
Total S A =2*1/2 *4.1412* 7.7274 + 2*20*8 +4.1412 *20
=32.0007+320 + 82.824 =434.8247 sq cms
Answer :Total S A of Glass = 434.8247 sq cms
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