Question

find the area of the triangle two sides o f which are 18cm and 10cm and the primeter is 42cm​

Answer 1

Answer:

perimeter = sum of all three side

42 = 18+10+ y

42-28. =y

14 cm. = y

area of triangle = using heron's formula

s = sum of all three side/2

=42/2 =21

=√{s(s-a)(s-b)(s-c)}

= √{21×3×11×7}

=√4851

=69.64 cm square