Summary Trigonometry 10 Notes

Types of Triangles: ● Adjacent
○ Non-hypotenuse side than is
● Acute next to given angle
○ Has three acute angles (less
than 90°) Other Need to Know Things
● Equilateral
○ All three sides are equal ● All three angles = 180°
● Right ● Only has 3 sides, no more, no less
○ One angle is a right angle ● Only has 3 angles, no more, no less
○ One 90° two acute angles ● Similar Triangles Rules
● Scalene ○ SSS
○ None of the sides are equal ■ Two triangles = if
● Isosceles have corresponding
○ At least two equal sides sides that are =
○ SAS
Need-to-Know Equations ■ Two triangles = if two
sides and the angle
● Area = B x H ÷ 2 between them are =
● a2 + b2 = c2 ○ AA
● ÷ side of larger triangle by the ■ Two triangles = if two
corresponding side of the smaller pairs of corresponding
triangle angles are =
● SohCahToa ● Example Case
● Sine
○ Opp ÷ Hyp
● Cosine
○ Adj ÷ Hyp
● Tangent
○ Opp ÷ Adj

Sides of a Right Triangle

● Hypotenuse
○ Longest side
○ Always opposite of the 90°
angle
● Opposite
○ Across from a given angle