Geometry

isosceles triangle ✘ equilateral triangle ✘ scalene triangle ✘ right angle ✔

diameter ✘ radius ✘ area ✘ midpoint ✔

pentagon ✘ hexagon ✘ nonagon ✘ decagon ✔

2 + r ✘ 2r ✘

r⁄2

✘

2⁄r

✔

complementary angles ✘ reflective angles ✘ supplementary angles ✘ vertical angles ✔

2πr

✘

2π⁄r

✘

πr⁄2

✘

πr

✔

0.4 ✘ 0.69 ✘ 0.7 ✘ 0.5 ✔

π⁄r²

✘

πr²

✘

π²r

✘

r²⁄π

✔

acute angles ✘ reflective angles ✘ obtuse angles ✘ right angles ✔

decagon ✘ quadrilateral ✘ nonagon ✘ hexagon ✔