Question

The two sides of a triangular flag are 30cm and 40cm. Find the length of the third side if the perimeter of the flag is 130cm.

plz reply fast

Answer 1

Answer:

A=hb/2

A=s(s﹣a)(s﹣b)(s﹣c)

P=a+b+c

s=a+b+c/2

h≈17.77561cm

Answer 2

$Perimeter = \: Sum \: of \: \\ all \: sides$

$Let \: the \: sides \: be \: a , b \: and \: c$

$a + b + c = perimeter \\ \\ 30 + 40 + c = 130 \: cm \\ \\ 70 + c = 130 \: cm \\ \\ c = 130 - 70 \\ \\ c = 60 \: cm$