Test 1 Study Guide

Area of a sector

where θ is an angle in radians ● The sum of the angles of a triangle is 180° ● In a triangle, the combined length of any two sides exceeds the third side ● The largest angle is opposite the largest side

● 𝑠𝑖𝑛 θ = 𝑥 => 𝑠𝑖𝑛−1𝑥 = θ, same applies for 𝑐𝑜𝑠 and 𝑡𝑎𝑛 ● Cofunctions

𝑐𝑜𝑓𝑢𝑛𝑐𝑡𝑖𝑜𝑛1(90 − θ) = 𝑐𝑜𝑓𝑢𝑛𝑐𝑡𝑖𝑜𝑛2; 𝑐𝑜𝑠(90 − θ) = 𝑠𝑖𝑛 θ ● 𝑠𝑖𝑛 and 𝑐𝑜𝑠, 𝑐𝑠𝑐 and 𝑠𝑒𝑐, and 𝑡𝑎𝑛 and 𝑐𝑜𝑡 are cofunctions ● One side of an angle of depression or elevation must be horizontal ● A bearing with two directions indicates the start and direction; i.e

Prove AA similarity

) c. If theres a shadow, put them both on the same level and facing the same way d. Dont forget the little angle marks 10

Drawings can be kinda hard but you got this

D c. If youre stuck, list what you know and the given