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    				| 1. | 
                                    The base edge of a square prism is 15 cm.The total surface area is 1950 m2.i. What is its height ?ii. Calculate the volume. | 
                            
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Answer»  i. Base edge = 15 cm Total surface area = Base area + Lateral surface area = 2a2 + 4ah (base egde is ‘a’) 1950 = 2 × 152 + 4 × 15 × h 1950 = 450 + 60h 60h = 1950 – 450 = 1500 h = 1500/60 = 25 cm ii. Volume = a2 × h = 15 × 15 × 25 = 5625 cm3  | 
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