Question

the two sides of a trangle are 5cm and 13cm and it's perimeter is 30cm.the area of a trangle in cm2 is

Answer 1

Hope this will help u

Answer 2

☆Hello friend☆
Perimeter of triangle=side +side+side
30 cm= 5cm+13cm+x
30 cm- 18 cm=x
12 cm=x
Area of triangle by Hero's Formula
$\sqrt{s(s - a)(s - b)(s - c) } \\ s = \frac{a + b + c}{2} \\ s = \frac{5 + 13 + 12}{2} = 15cm \\ \sqrt{15(15 - 5)(15 - 13)(15 - 12)} \\ \sqrt{15 \times 10 \times 2 \times 3} \\ \sqrt{3 \times 5 \times 2 \times 5 \times 2 \times 3} \\ 3 \times 5 \times 2$
30 cm^2
Hope it helps☺