4) To’rtburchakka aylana ichki chizilgan. To’rtburchakning ketma-ket uchta tomoni uzunliklarining nisbati 1:2:5 kabi, uning perimetri esa 60 sm ga teng. To’rtburchakning barcha tomonlarini toping.
5) Katetlari 18 sm va 24 sm bo’lgan to’g’ri burchakli uchburchak o’tkir burchaklarining bissektrisalarini toping.
Yozma ish, X sinf
I-tur
II-variant 1) Agar a+b+c=5 va ab+ac+bc=5 bo’lsa, a2+b2+c2=?
2). Ifodani soddalashtiring.
3).Hisoblang. .
4). To’rtburchakka aylana ichki chizilgan. To’rtburchakning ketma-ket uchta tomoni uzunliklarining nisbati 1:2:5 kabi, uning perimetri esa 60 sm ga teng. To’rtburchakning barcha tomonlarini toping.
5) Diagonali 8 sm, ular orasidagi burchak 45º bo’lgan teng yonli trapetsiyaning yuzini toping.