Tolong bantu mtk kls 8 ya kak
Jawab:
<c+<d = 215°
Panjang busur FG = 13,2 cm
Penjelasan dengan langkah-langkah:
Jumlah sudut = 360
Jumlah sudut berhadapan = 180
a+c =180°
c = 180-a
c = 180-80 = 100°
b+d = 180
d= 180-b
= 180-65 = 115°
<c+<d = 100+115 = 215°
Luas FOG = 46,2 cm²
r=7 cm
π=22/7
Luas Lingk = πr²
= 22/7×7² =154cm²
Kll lingk = 2πr
= 2×22/7×7 = 44 cm
P. busur FG = L FOG/L Lingk x Kll Lingk
= 46,2/154 x 44
= 13,2 cm
Materi : Garis dan Sudut
Soal Nomor 1
Konsep Segi Empat ( 360° )
A + B + C + D = 360°
80° + 65° + ( C + D ) = 360°
( C + D ) = 360° – 145°
( C + D ) = 215°
Soal Nomor 2
Besar Sudut Juring
a = L( Juring ) / L × 360°
a = 46,2 cm² / ( 22/7 × 7 × 7 ) × 360°
a = 46,2 cm² / 154 cm² × 360°
a = 3/10 × 360°
a = 3 × 36°
( a = 108° )
Langsung Saja
Pb = ( a/360° )( π × d )
Pb = ( 108°/360° )( 22/7 × 14 cm )
Pb = 3/10 × 44 cm
Pb = 3 × 4,4 cm
{ Pb = 13,2 cm }
Semoga bisa membantu