Base edge of the square pyramid = 30 cm
Height = 30 cm
Slant height = \(\sqrt{30^2+15^2}\)
= \(\sqrt{900+225}\) = \(\sqrt{1125}\) = \(15\sqrt{5}\)
Lateral surface area = \(4\times\frac{1}{2}\times15\sqrt{2}\times30\)
= 60 x 15√5 = 900√5 sq.cm
Total surface area = 900 + 900√5
= 900(1 + √5) sq.cm
