Question

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Answer 1

Jawab:

Penjelasan dengan langkah-langkah:

11. Terdiri dr 3 bagian yaitu :

    a. 1/4 lingkaran

    b. persegi

    c. 1/4 lingkaran

 --> panjang sisi persegi = 48-14-14 = 20 dm

 --> r lingkaran = 14 dm

a. L. 1/4 lingkaran = 1/4 x π x r² = 1/4 x 22/7 x 14 x 14 = 154 dm²

b. L. persegi = s x s = 20 x 20 = 400 dm²

c. L. 1/4 lingkaran = 1/4 x π x r² = 1/4 x 22/7 x 14 x 14 = 154 dm²

------>>> L. keseluruhan = 154 + 400 + 154 = 708 dm²

12. r lingkaran = 10 cm

------->>> L. 3/4 lingkaran = 3/4 x π x r² = 3/4 x 3,14 x 10 x 10 = 235,5 cm²