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A tetrahedron has vertices O (0,0,0), A(1,2,1,), B(2,1,3) and C(-1,1,2), the angle between faces OAB and ABC will be
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ABCD is a tetrahedron such that each of the triangleABC , triangleABD and triangleACD has a right angle at A. If ar(triangleABC) = k_(1). Ar(triangleABD)= k_(2), ar(triangleBCD)=k_(3) then ar(triangleACD) is
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DABC be a tetrahedron such that AD is perpendicular to the base ABC and angle ABC=30^(@) . The volume of tetrahedron is 18. if value of AB+BC+AD is minimum, then the length of AC is
NAND LAL PUBLICATION-UNDERSTANDING ELEMENTARY SHAPES -SAMPLE PAPER FOR PRACTICE (Fill in the blanks)
