# Angle of diagonal

Angle between the body diagonal of a regular quadrilateral and its base is 60°. The edge of the base has a length of 10cm. Calculate the body volume.

Correct result:

V =  2449.49 cm3

#### Solution:

$a=10 \ \text{cm} \ \\ A=60 ^\circ \rightarrow\ \text{rad}=60 ^\circ \cdot \ \dfrac{ \pi }{ 180 } \ =60 ^\circ \cdot \ \dfrac{ 3.1415926 }{ 180 } \ =1.0472=π/3 \ \\ \ \\ u_{1}=\sqrt{ 2 } \cdot \ a=\sqrt{ 2 } \cdot \ 10 \doteq 10 \ \sqrt{ 2 } \ \text{cm} \doteq 14.1421 \ \text{cm} \ \\ \tan A=h / u_{1} \ \\ \ \\ h=u_{1} \cdot \ \tan(A)=14.1421 \cdot \ \tan(1.0472) \doteq 10 \ \sqrt{ 6 } \ \text{cm} \doteq 24.4949 \ \text{cm} \ \\ \ \\ V=a^2 \cdot \ h=10^2 \cdot \ 24.4949=2449.49 \ \text{cm}^3$

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