Download 4.2-4.3 Notes - Garnet Valley

Geometry B
Date: _________________
4.2-4.3 Classifying Triangles and Angle Relationships in Triangles
Objective: To classify triangles by their angle measures and side lengths
To use triangle classification to find angle measures and side lengths
To find the measures of interior and exterior angles of triangles
Ex. 1: Classifying Triangles by Sides and Angles
Classify each triangle by its sides and angles (two terms for each)
a.
b.
Ex. 2: Using Triangle Classification
a. Find the side lengths of the
equilateral triangle.
c.
d.
b. Find the side lengths of JKL .
Ex. 3: Music Application
A manufacturer produces musical triangles by bending pieces of steel into the shape of an
equilateral triangle. The triangles are available in side lengths of 4 inches, 7 inches, and 10
inches. How many 4-inch triangles can the manufacturer produce from a 100 inch piece of steel?
Ex. 4: Find Angles Measures in Triangles
Find the measures of the missing angles in the diagram below.
mWXY  _________
mXWY  _________
mXWYZ  ________
More about Angle Measures:

In a right triangle, the two acute angles will always add up to _______.
o The acute angles in a right triangle are _________________________.

Each measure of an equiangular triangle is always ___________.
Ex. 5: Find the measure of each variable.
a.
b.
HW: 4.2-4.3 Worksheet