1.

the perimeter of an isosceles triangle is 20 cm. if one of the equal sides is 19/4 cm long,find the measure of the third side.

Answer» LET the THIRD SIDE will be X.
then,

19 \div 4 + 19 \div 4 + x = 20 \\ 38 \div 4 + x = 20 \\ (38 + 4x) \div 4 = 20 \\ 38 + 4x = 80 \\ 4x = 80 - 38 \\ 5 \\4x = 42 \\ x = 42 \div 4
x = 42/4
x=10.5cm


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