Solve A=0.5*45*45*(141-sin(144))

$$A = 0.5 \times 45 \times 45 \times ( 141 - \sin ( 144 ) )$$

Solve for A

$$A=142167.367432053870885$$

Steps for Solving Linear Equation

Evaluate trigonometric functions in the problem

$$A = 0.5 \cdot 45 \cdot 45 \cdot {(141 - 0.5877852522924732)}$$

Multiply 0.5 and 45 to get 22.5.

$$A=22.5\times 45\left(141-0.5877852522924732\right)$$

Multiply 22.5 and 45 to get 1012.5.

$$A=1012.5\left(141-0.5877852522924732\right)$$

Subtract 0.5877852522924732 from 141 to get 140.4122147477075268.

$$A=1012.5\times 140.4122147477075268$$

Multiply 1012.5 and 140.4122147477075268 to get 142167.367432053870885.

$$A=142167.367432053870885$$

Assign A

$$A≔142167.367432053870885$$