Question

What's the value of x in the figure? A) 78° B) 57° C) 76° D) 33°

Answer 1

A)78°

135°+a° =180°

a°=45°

57°+x°+a°=180°

57°+x°+45°=180°

102°+x°=180°

x°=180°-102°

x°=78°