Stage 9 - Q3 - 3 marks
20119
The right square pyramid has base side \(a\) and perpendicular face slant height \(l\). Find its total surface area.
Right square pyramid
\(a=10\text{ cm}\)
\(l=15\text{ cm}\)
l: face slant height
Hint
The slant height is perpendicular within a triangular face.