acute angles triangle :if the angle measure is from 0°to 89° (less than 90°)

right angles triangle:If the angle measure of any one angle is equal to 90°

Obtuse angles triangle : If any of the angle measure is greater than 90°and less than 180°

OBTUSE ANGLED TRIANGLE: IF ANY ONE ANGLE IS GREATER THAN 90⁰AND LESS THAN 180⁰

A = (-0.14, 4.92)
B = (-1.84, 1.32)
C = (2.22, 1.36)
t1, c, a, b = Polygon(A, B, C)
D = (9.44, 1.12)
E = (5.34, 1.26)
D' = Rotate(D, 90°, E)
α = Angle(D, E, D')
f = Segment(E, D)
g = Segment(E, D')
h = Segment(D', D)
β = Angle(B, A, C)
γ = Angle(C, B, A)
δ = Angle(A, C, B)
F = (4.4, -4.58)
G = (-0.92, -4.56)
F' = Rotate(F, 115°, G)
ε = Angle(F, G, F')
i = Segment(F', G)
j = Segment(G, F)
k = Segment(F, F')
d = true
e = true
l = true
text1: "ACUTE ANGLED TRIANGLE:if all angles is less that 90⁰" + γ + "," + γ + "," + δ + "∠90⁰."
text2: "RIGHT TRIANGLE:IF ANLGE IS 90⁰(" + α + "=90⁰)"