Triangles & Congruence
What is the sum of angles in any triangle?
180°
What is the radius if diameter = 14?
7
Midpoint of (0,0) and (4,4)?
(2, 2)
Does a reflection preserve shape?
Yes
Volume of a cube with side 2?
8
Which postulate proves triangle congruence: SSS, SAS, or AAA?
SSS and SAS
What is the measure of a semicircle in degrees?
180°
Distance between (0,0) and (3,4)?
5
A rotation of 180° does what to a figure?
Turns it upside down
Formula for volume of a rectangular prism?
l*w*h
In an isosceles triangle, what is always true?
Base angles are congruent
Formula for circumference of a circle?
2πr or πd
Slope of a vertical line is:
Undefined
Which transformation changes size?
Dilation
Volume of a cylinder formula?
πr²h
A triangle has angles 35° and 65°. What is the third angle?
80°
An inscribed angle intercepting a diameter measures what?
90°
Find slope between (2,3) and (6,11).
2
Reflection over the y-axis changes (x, y) to:
(-x, y)
A sphere’s volume depends on what variable?
radius
Explain why SSA does NOT prove triangle congruence.
It can create two possible triangles (ambiguous case)
If a central angle is 120°, what is its intercepted arc?
120°
Write the equation of a line with slope 3 and y-intercept -2.
y = 3x - 2
Do translations preserve distance and angle measure?
Yes
If radius doubles, what happens to sphere volume?
It increases by a factor of 8