Area math
Area of a right-angled rectangle or square = W x L
Area of a right-angle triangle = ½ (W x L)
Area of centreline “C” = (area A + area B) ÷ 2
Area of a circle =π R² or (D²π) ÷ 4
Circle math
Circumference = π D or 2πR or π2R
Corrected diameter = (Major diameter – width)
Volume math
Volume(V) = Area X Height (Ht)
V = W x L x Ht.
Perimeter method;
Square or rectangle - add up the outer perimeter. Subtract (4 X width) = length
Triangle math
Pythagoras theorem; to find the hypotenuse of a right-angle triangle; a² + b² = c² ; (3² + 4² = 9 + 16 = 25), c = √25 = 5
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