Answers

2016-04-14T08:56:19+05:30
The triangle with side lengths 20, 21 and 29 is right angled triangle 
so two altitudes of triangle are two side lengths of triangle 
they are 20,21

area of triangle = 1/2 base*altitudes 
                         = 1/2(20*21)
                           = 210cm²
now take 29 as base and altitude be h

210 =1/2(29*h)
420/29=h

sum of the altitudes = 20+21+420/29
sum of the altitudes = 1069/29 (or)55.482
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