Congruent triangles
If ∆ABC ≅ ∆DEF and AB = 5 cm, which side of ∆DEF is also 5 cm?
DE
What is the measure of a semicircle?
180°
What’s the formula for circumference in terms of radius?
2πr
Find the area of a circle with radius 5 (in terms of π).
25π
What is the range of this set: 10, 15, 25, 30, 50
Which postulate proves triangles are congruent if you know 2 sides and the included angle?
SAS
What type of arc uses three letters in its name?
Major arc
What is the area formula for a circle?
πr²
Find the circumference of a circle with diameter 12 (in terms of π).
12π
What’s the mode of this set: 60, 75, 60, 80, 95?
60
If ∆AWE ≅ ∆SOM, which angle corresponds to ∠M?
∠E
What do you call an angle whose vertex is at the center of a circle?
Central Angle
If the area is 144π cm², what is the radius?
12 cm
If radius = 8, what is the area of a semicircle?
32π
How do you find the IQR?
3Q-1Q
If ∆CAR ≅ ∆DIN, what side is congruent to RC?
What is the sum of all central angles in a circle?
360°
In a circle, an inscribed angle measures 40°. What is the measure of its intercepted arc?
80°
A sector has a central angle of 90° and a radius of 4. What is the sector’s area?
4π
What kind of correlation is shown when both variables increase together?
Positive correlation
Name all 5 congruence postulates.
SSS, SAS, ASA, AAS, and HL
If a central angle measures 120°, what fraction of the circle's circumference does its arc represent?
1/3 of the circumference
If the diameter of a circle is 8x – 2 and the radius is 15 cm, what is the value of
x=4
If the area is 64π, what is the diameter?
16
What is the mean of this data: 50, 70, 80, 90, 80?
74