Triangles
The Triangle Sum Theorem states
the sum of the interior angles of any triangle is always exactly 180 degrees.
How many sides does a quadrilateral have?
4
What do we call two lines that never intersect and stay the same distance apart?
Parallel lines
What do we call the distance from the center of a circle to the edge?
radius
How many degrees are in a straight angle?
180°
A triangle has side lengths 5, 5, and 8.
What type of triangle is it classified as by its sides?
Isosceles triangle
A quadrilateral has exactly one pair of parallel sides.
What type of quadrilateral is it?
Trapezoid
Two lines intersect to form a 90° angle.
What type of lines are they?
Perpendicular lines
A circle has a diameter of 14.
What is the radius?
7
What do we call an angle smaller than 90°?
acute angle
A right triangle has legs of 6 and 8.
What is the length of the hypotenuse?
10
A rectangle has a length of 12 and a width of 5.
What is its area?
60 square units
Angle 1 and Angle 2 are vertical angles.
If Angle 1 = 48°, what is Angle 2?
48°
What is the formula for the circumference of a circle?
C=2πr or C=πd
What tool do we use to measure angles?
Protractor
One exterior angle of a triangle measures 120°. One remote interior angle measures 45°.
What is the measure of the other remote interior angle?
75°
A parallelogram has one angle measuring 65°.
What is the measure of the adjacent angle?
115°
Two parallel lines are cut by a transversal.
If a corresponding angle measures 112°, what is the measure of its corresponding partner angle?
112°
A circle has a radius of 5.
What is its area in terms of π\piπ?
25π
What is the name of a polygon with 8 sides?
Octagon
Triangle ABC is similar to Triangle DEF.
If AB = 4, BC = 6, and DE = 10, what is the length of EF?
15
A rhombus has diagonals measuring 10 and 24.
What is the area of the rhombus?
120 square units
Two parallel lines are cut by a transversal.
One same-side interior angle measures 73°.
What is the measure of the other same-side interior angle?
107°
An arc measures 90° in a circle with radius 8.
What is the length of the arc in terms of π\piπ?
4π
True or False: A square is also a rectangle.
true