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Area of a Circle
πr²
Circumference
πd
Semicircle Circumference
½ πd
When asked to find the perimeter of a regular shape and a semicircle what should you do?
Find the perimeter of the regular shape (add all sides)
Find the perimeter of the semicircle( ½ πd)
Add them
Distance Formula
D=√(x2-x1)²+(y2-y1)²
Area for a Triangle
½ bh
Pythagorean Theorem
a²+b²=c²
Slope
y2-y1/x2-x1