daca triunghiurile sun echilaterale toate unghiurile sun egale cu 60⁰
a)
z=60⁰
x+34⁰=60⁰ x=60⁰-34⁰=26⁰
y-15=60⁰ y=60⁰+15⁰=75⁰
b)
10⁰+z=60⁰ z=60⁰-10⁰=50⁰
y:2=60⁰ y=60⁰×2=120⁰
180⁰-x+80⁰=60⁰ 260⁰-x=60⁰ x=260⁰-60⁰=200⁰
c)
z-40⁰=60⁰ z=60⁰+40⁰=100⁰
y+20⁰=60⁰ y=60⁰-20⁰=40⁰
x+y=60⁰ x+40⁰=60⁰ x=60⁰-40⁰=20⁰