Angles in Triangles | Ameba

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Angles in Triangles

Transformations
Rectangle and Square
Triangle
Parallelogram
Trapezium
Cube and Cuboid
Circles
Sectors
Prism
Cylinder
Pyramid
Cone
Sphere
Angles on Line & Point
Angles in Triangles
Parallel Line Angle Rules
Polygons
Triangles & Congruence
Similarity & Scale
Pythagoras Theorem
Trigonometry
Special Trig Values
Sine Rule & Cosine Rule
Vector Notation & Meaning
Vector Addition & Multiplication
Position & Translation Vectors
Parallel & Collinear Vectors
Midpoint & Ratio in Vectors
Vector Proofs

Angles in a triangle add up to \(180°\).

\( a + b + c = 180° \)

Sum of triangle angles

Isosceles triangle: two equal angles.

Isosceles triangle angle rule

Practice

Lvl 1

Two angles of a triangle are 50° and 60°. Find the third angle.

Triangle angle example

A. 70°
B. 110°
C. 60°

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