Willi noticed the patterns on the square tiles and tried to calculate the area of the shaded part. Leave your answer in 2 decimal places. (Take π = 3.14)
Area of the rectangular shaded part
= ( ¹₂ x 74 x 74) - ( ¹₂ x 54 x 54)
= 2738 - 1458
= 1280 cm²

Area of the square
= 74 x 74
= 5476 cm²

Area of the quadrant
= 3.14 x 74 x 74 x ¹₄
= 4298.66 cm²

Area of outside of the quadrant in the square
= 5476 - 4298.66
= 1177.34 cm²

Area of the small square
= 37 x 37
= 1369 cm²

Area of the small quadrant
= ¹₄ x 3.14 x 37 x 37
= 1074.665 cm²

Area outside of the small quadrant in the small square
= 1369 - 1074.665
= 294.335 cm²

Area of the shaded part
= 1177.34 - 294.335 + 1280
= 2163.005 cm²

Answer(s): 2163.01 cm²