<em>Cone : r radius of </em><em>bottom circle, L lateral length, h = perpendicular height</em> <em> Total surface area = π r² ( 1 + L / r ) Volume = 1/3 π r² h L² = r² + h²
I'm pretty sure its 100 because if she gave each of her 19 students 5 invitations that equals 95. (19×5=95) And She had 5 leftover equals 100. (95+5=100)