Question

What is the area and perimeter of: square rectangle circle triangle...???????????

Answer 1

area of a square=(side)²
perimeter of a square=4×side
area of a rectangle=length×breadth
perimeter of a rectangle=2(length+breadth)
area of a circle=πr²
perimeter of a circle=2πr
area of a triangle=1/2×base×height or [(√3)/4]×(side)² for equilateral triangle  or √[s(s-a)(s-b)(s-c)] where s=(a+b+c)/2 
perimeter of triangle=a+b+c  where a,b,c are sides of a triangle