- The sum of the measures of the angles in a quadrilateral is __.
- The sum of the measures of the interior angles in an octagon is __.
- In ∆ABC,if the measure of ∠Ais 65°and the measure of ∠Bis 60°, then which side is longest? __.
- The angles in an equilateral triangle must have a measure of __.
- Can an isosceles triangle include angles of 35°and 60°? Why or why not?
- Draw a diagram to illustrate the external angle theorem.
- If a triangle has sides of lengths 20 and 15, then the third side must be less than __ but greater than
__. - Is it possible for a triangle to have sides of lengths 5, 8, and 14? Why or why not?
- If an isosceles triangle includes an angle of 25°, the other two angles could have measures of __ and
__ or __ and __. - In the figure above, QS
––
and RT––
are diameters of the circle and Pis notthe center. Complete the statement
below with >, <, or =.
PQ+PR+PS+PT__________ QS+RT
(not shown)R
T
S
Q
P
R
T
S
Q
Concept Review 2: Triangles
366 McGRAW-HILL’S SAT