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2-D figures
Quadrilaterals, Polygons
Question | Answer |
---|---|
Square | 4 right angles 4 equal sides |
Quadrilateral | just 4 sides - no assumptions about angles or sides |
Rhombus | 4 equal sides |
Rectangle | 4 right angles |
Parallelogram | opposite sides parallel opposite sides congruent |
Trapezoid | exactly one pair of parallel sides |
Sum of the angles of a quadrilateral | 360 |
Pentagon | 5 sides |
Hexagon | 6 sides |
Heptagon | 7 sides |
Octagon | 8 sides |
Nonagon | 9 sides |
Decagon | 10 sides |
Sum of the measures of the angles of a polygon with n sides | (n-2)180 |
Sum of the measures of the exterior angles of any polygon | 360 |
Complementary angles | add to 90 |
Supplementary angles | add to 180 |
Vertical angles | opposite; always congruent |
Area of a parallelogram | A = bh |
Area of a triangle | A = 1/2 bh |
Area of a trapezoid | A = 1/2 (b1+b2)h |
Area of a circle | A = π times the radius squared |
Circumference of a circle | C = πd or C = 2πr |