Geometry Unit 7 Flashcards
Pythagorean theorem
a2+b2=c2 (c is hypotenuse)
Pythagorean triplets
3, 4, 5. And 5, 12, 13.
if c2=a2+b2, what type of triangle is it?
right
if c2>a2+b2, what type of triangle is it?
obtuse
if c2<a2+b2, what type of triangle is it?
acute
45-45-90 triangles are formed from _____
the diagonal of a square
45-45-90 triangles are called _______ triangles
isosceles right
are both legs the same in a 45-45-90 (isosceles right) triangles?
yes.
how to find the hypotenuse of a 45-45-90 (isosceles right) triangles?
leg * √2
30-60-90 triangles are formed from _____
equilateral tirangle’s
how to find the long leg of a 30-60-90 triangle?
SL√3
how to find the hypotenuse of a 30-60-90 triangle?
2(SL)
rect/square: Area=
lw
Triangle: area=
1/2bh
circle: area=
Pi(radius^2)
what is a trig ratio
ratio of the lengths of 2 sides of a right triangle
sin=
opposite/hypotenuse
cos=
adjacent/hypotenuse
tan=
opposite/adjacent
never find the trig ratio from the _____ angle
right (opp. side and hypot. would be the same)
trig only works in ______ triangles
right
