Angles & Lines
Angles on a straight line add up to how many degrees?
180 degrees
The sum of the interior angles of a triangle is _______.
180∘
How many sides does a pentagon have?
5
Reflect (3,-5) across the x-axis.
(3,5)
A rectangle has sides 10 and 4. Find its area.
40
Two angles add up to 90 degrees. What are they called?
Complementary
One angle of a triangle is 90∘. What kind of triangle is it?
Right triangle
Find a perimeter of a square with side length 9.
36
Write the equation of a line through the origin with slope 2.
y=2x
A square has side length 12. Find its area.
144
Two angles add up to 180 degrees. What are they called?
Supplementary
What do you call a triangle with three equal sides?
Equilateral
A circle has a diameter of 14. What is the radius?
7
Find the slope of the line through (0,0) and (4,2)
slope = 1/2
Find the perimeter of a triangle with sides 5, 7, and 9.
If two lines are perpendicular, what is the relationship between their slopes?
The slopes are negative reciprocals
Use the Pythagorean Theorem: A right triangle has legs of 6 and 8. Find the hypotenuse.
10
What is the formula for circumference of a circle?
c=pid or c=2pir
Find the slope of the line through the points (1,3) and (2,5)
slope=2
A circle has radius 5. Find its circumference.
c=2pir
c=10pi
A linear pair of angles measures 2x and and 50∘. Solve for x
x = 65^∘
In an isosceles triangle, the vertex angle is 40∘ , what are the base angles?
70∘
A circle has a radius of 6. Find the area.
a=pir^2
a=36pi
Write the equation of the line that passes through the points (1,3) and (2,5)
y=2x+1
Find the area of a right triangle with base 6 and height 8.
24