Here we are given the three sides of the triangle.
So we have Heron's formula to find its area.
Heron's formula is given by :

where A, B and C are sides of triangle and S is semi perimeter which is given by,

plugging values of A, B and C to find S

S=13.5
Now plugging values of A, B , C and S in Heron's formula

A=26.14 mm²
Answer: Area of triangle is 26.14 mm².
The answer would be 25t^2 + 40t + 16
Answer:78
Step-by-step explanation:
Step-by-step explanation:
I am not sure about the answer of (b). Hope it helps :)