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Four identical cones each of radius 10.5...

Four identical cones each of radius 10.5 cm and height 14 cm are cut from a cuboid of dimensions 30 cm x 32cm x 40cm (base of each cone lies, on the surface of cuboid). What is the total surface area (in `cm^2`) of the remaining solid?
10.5 सेमी. त्रिज्या तथा. 14 सेमी. ऊँचाई वाले चार समान शंकुओं. को एक'घनाभ में से काटा गया है जिसके आयाम 30 सेमी.x 32सेमी.x40 सेमी. है (प्रत्येक शंकु का आधार घनाभ की सतह पर है) बचे हुए ठोस का कुल पृष्ठीय क्षेत्रफल (सेमी. में) क्या है?

A

A)6528

B

B)7804

C

C)5926

D

D)6824

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