Download Triangles

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Date:_______________________
Triangles
Lesson 10.1 NOTES
Ex. 1) Find the value of x and the missing angle measurements. Then classify the triangle by its angles.
100°
x+14
x+20
Ex. 2) The ratio of the angle measures of a triangle is 1 : 3 : 5. Find the angle measures, and then classify the
triangle by its angles.
Ex. 3) The Triangle Inequality Theorem states that the sum of the lengths of any two sides of a triangle is
greater than the length of the third side. Using this theorem, determine if the given side lengths form a
triangle.
a) 4, 5, 10
b) 4, 5, 9
c)4, 5, 7
Ex. 4) The perimeter of an isosceles triangle is 35 inches. The length of the shortest side is 4 inches less than
the length of the other two sides. Find the lengths of all 3 sides.
Ex. 5) The perimeter of an equilateral triangle is 42.9 meters. Find the length of each side.
PreAlgebra
SN10.1
Name: __________________________
Pd. _____
Date:_______________________
YOU-TRY:
1. Find the value of x and the missing angle measurements. Then classify the triangle according to its angle
measurements.
3x+24
5x
60°
2. The perimeter of the following triangle is 65 feet. Find the unknown side lengths. Then classify the
triangle by its side lengths.
4.8 ft
3. Using the triangle inequality theorem to determine if the given side lengths form a triangle.
a) 3, 6, 2
PreAlgebra
b) 3, 10, 8
c) 10, 18, 10
SN10.1