find the angles
Triangle angles
vocabulary
Shapes
form a triangle
100
∠1=60°；∠2=40°；
∠3=
80°
100
有一个角为900的三角形
right angle
100
equilateral triangle
100
draw a square
100
side a 2cm
side b 1 cm
side c 1 cm
Can these three sides form a triangle?
No, can not.
200
在等腰三角形中
∠1=120°
∠2=
∠3=
30°
200
acute triangle
200
isosceles triangle
200
draw a circle
200
side a 4cm
side b 6 cm
side c 5 cm
Can these three sides form a triangle?
yes, they can.
300
∠1=53°；∠2=82°；
∠3=
45°
300
obtuse triangle
300
scalene triangle/acute triangle
300
rectangle
300
side a 7cm
side b 3 cm
side c 14 cm
Can these three sides form a triangle?
No, can not.
400
obtuse triangle
400
scalene triangle/obtuse triangle
400
trapezoid
400
side a 11cm
side b 15 cm
side c 30 cm
Can these three sides form a triangle?
No, can not.
500
side a 22cm
side b 11 cm
side c 35 cm
Can these three sides form a triangle?
No, they can not.