Angles
Measure of a right angle?
90°
Sum of angles in a triangle?
180°
Distance from center to edge?
Radius
Lines that never meet?
Angles that add to 180°?
Supplementary angles
Triangle with all equal sides?
Equilateral
Distance across circle through center?
Diameter
Lines that meet at 90°
Perpendicular lines
Angles that add to 90°?
Complementary angles
Triangle with two equal sides?
Isosceles
Formula for circumference?
2πr
Point where two lines meet?
Intersection
Opposite angles formed by intersecting lines?
Verticle angles
Triangle with no equal sides?
Scalene
Formula for area?
πr²
Part of a lone with two endppoints?
Line segment
Sum of angles around a point?
360°
Formula for: a²+b²=c²
Pythagorean Theorem
Half a circle?
Semicircle
Line that extends forever in both directions?
Line