Question

area of triangle two sides of which are 12cm, 15 cm, and perimeter 42 cm is​

Answer 1

Answer:

let the perimeter of triangle be x

Step-by-step explanation:

perimeter = 1st side + 2nd side + 3rd side

therefore, x = 12 + 15 + 42

x = 69 cm

please mark it as brainliest answer

Answer 2

Answer:

third side = (42-12+15)=42-37

=15cm

area =1/2base ×height

=1/2×12×15

=180/2=90cm