Jawaban:
18. 87
19. 9cm
20. 30cm
21. 77cm2
22. 146cm2
Penjelasan dengan langkah-langkah:
18. a=b=c
= 58÷2= 29°
a+b+c= 29+29+29= 87
19. AB= 1/2 × 18 = 9cm
20. BC= 34cm
BE= 24-8= 16cm
CE= √ 34^2 - 16^2
CE= √ 1156-256
CE= √ 900
CE= 30cm
21. 60/84=55/COD
5/7= 55/COD
5COD= 385
Luas COD= 77cm2
22. busur besar = 22/7 × 28
= 88
busur kecil= 22/7 × 14 = 44
total luas = 88 + 44 + 7 + 7 = 146 cm2
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Jawaban:
18. 87
19. 9cm
20. 30cm
21. 77cm2
22. 146cm2
Penjelasan dengan langkah-langkah:
18. a=b=c
= 58÷2= 29°
a+b+c= 29+29+29= 87
19. AB= 1/2 × 18 = 9cm
20. BC= 34cm
BE= 24-8= 16cm
CE= √ 34^2 - 16^2
CE= √ 1156-256
CE= √ 900
CE= 30cm
21. 60/84=55/COD
5/7= 55/COD
5COD= 385
Luas COD= 77cm2
22. busur besar = 22/7 × 28
= 88
busur kecil= 22/7 × 14 = 44
total luas = 88 + 44 + 7 + 7 = 146 cm2