P 15-dars. To’rtburchaklar Мусаев Хусан Ta’rif

46. Teng yonli trapetsiyaning kichik asosi yon tomoniga teng, diagonali yon tomoniga perpendikulyar. Uning burchaklarini toping.
47. Teng yonli trapetsiyaning qarama-qarshi burchaklari ayirmasi 50° ga teng. Uning burchaklarini toping.
48. Teng yonli trapetsiyaning burchaklaridan biri 72° ga teng. Shu trapetsiyaning qolgan burchaklarini toping.
49. Teng yonli trapetsiyaning katta tomoni 5,4 dm ga, yon tomoni 3 dm ga va ular orasidagi burchak 60° ga teng. Uning kichik asosini toping.
50. Agar parallelogramning burchaklaridan biri 25° bo’lsa, parallelogramning hamma burchaklarini toping.
51. Agar parallelogramning burchaklaridan biri 100° bo’lsa, parallelogramning hamma burchaklarini toping.
52. Agar parallelogramning burchaklaridan biri boshqasidan 2 marta katta bo’lsa, parallelogramning hamma burchaklarini toping.
53. Agar parallelogramning burchaklaridan biri boshqasidan 90° ortiq bo’lsa, parallelogramning hamma burchaklarini toping.
54.Parallelogrammning qo’shni tomonlari yig’indisi 20 sm ga, ayirmasi esa 12 sm ga teng. Shu parallelogrammning tomonlarini toping.
55. O’tkir burchagi A bo’lgan ABCD parallelogrammning B uchidan AD tomoniga BK perpendikular o’tkazilgan, BK=0,5AB. C va D burchaklarni toping.
5 6. ABCD parallelogrammda AC diagonal 24 sm ga teng bo’lib, AD tomon bilan 30° li burchak hosil qiladi, O nuqta AC va BD diagonallarning kesishish nuqtasi (26-rasm). OE⊥AD. OE kesmaning uzunligini toping.
57. Parallelogrammning diagonali uning ikki tomoni 35° va 55° li burchaklar tashkil qiladi. Shu parallelogrammning hamma burchaklarini toping.
58. ABCD to’g’ri to’rtburchakda AB tomon 32 sm ga teng, BD diagonali esa AB tomon bilan 60° li burchak hosil qiladi. AC diagonalni toping