Answer:
900°
Step-by-step explanation:
interior angles of a polygon = (n−2)×180°, where n is number of sides
for heptagon it is: (7-2)×180°= 900°
900
Eight thousand fourteen hundred twelve and seven
a*2+b*2+c*2+d
If i's meant to be Pythagorean theorem, a*a+b*b=c*c
