Back to:
Calculating Angles in Triangles WORKSHEET
Suitable for Grades: 4th Grade
CCSS: 4.MD.C.7, 7.G.B.5
CCSS Description: Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.
Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.
Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.
Calculating Angles in Triangles WORKSHEET DESCRIPTION
This fast progressing worksheet takes students through a whole range of angles in triangles problems and will suit a variety of learners and year groups.
In section A, learners will calculate the missing angles in triangles where two angles are known, calculate missing angles in isosceles triangles where either one base angle or the top angle is known, and an equilateral triangle.
Section B consists of multi-step problems including the use of external and vertically opposite angles and triangles within triangles. Challenge your students with an extension question that will present them with an isosceles triangle within a pentagon and introduce the concept of interior and exterior angles of regular polygons.
