acute triangle

(a)  

Adjacent Angle

(a)  

angle measure

(a)  

ARC

(a)  

Complementary Angle

(a)  

degrees

(a)  

diagonal

(a)  

equilateral triangle

(a)  

hexagon

(a)  

intersecting lines

(a)  

isosceles triangle

(a)  

line

(a)  

line of symmetry

(a)  

line segment

(a)  

obtuse angle A "big" angle

(a)  

obtuse triangle

(a)  

octagon

(a)  

parallel lines

(a)  

parallelogram

(a)  

pentagon

(a)  

perpendicular lines

(a)  

plane

(a)  

point

(a)  

polygon

(a)  

protractor

(a)  

quadrilateral

(a)  

ray

(a)  

rectangle

(a)  

rhombus

(a)  

right angle

(a)  

right triangle

(a)  

scalene triangle

(a)  

side

(a)  

square

(a)  

straight angle

(a)  

Supplementary Angles

(a)  

Symmetric

(a)  

trapezoid

(a)  

triangle

(a)  

unit angle

(a)  

vertex

(a)