area = Pi*r^2
= Pi*10^2
=100Pi
=314.1592654
circumference = Pi*Diameter
= Pi*20
=20Pi
=62.83185307
If <a=90 or <b=90 or < c=90 the triangle is right
if one of the angles is > 90 the triangle is obtuse
if all the angles are < 90 the triangle is acute
Step-by-step explanation:
I hope this works for ya.