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

74. Kvadratning diagonallari kesishish nuqtasidan tomonlaridan birigacha bo’lgan masofa 2 dm 3 sm ga teng. Kvadratning perimetrini toping.
75. Kvadratning perimetri 30 sm ga teng. Uning tomoni nimaga teng?
76. ABCD kvadratda AC diagonal o’tkazilgan. ACD uchburchakning burchaklarini toping.
77. ABCD teng yonli trapetsiyada BC=20 sm, AB=24 sm va ∠D=60° bo’lsa, uning AD asosini toping.
78. Teng yonli trapetsiyaning burchaklaridan biri 125° ga teng. Trapetsiyaning qolgan burchaklarini toping.
79. Parallelogramm tomonlarining uzunlikari 4 sm va 6 sm ga teng. Shu parallelogram o’tkir burchagining bissektrisasi katta tomonini qanday kesmalarga bo’ladi?
80. O’tkir burchagi A bo’lgan ABCD parallelgramm berilgan. B uchidan AD tomonga BK perpendikular o’tkazilgan, AK=BK. C va D burchaklarni toping.
81. Rombning perimetri 16 sm ga, qarama-qarshi tomonlari orasidagi masofa 2 sm ga teng. Rombning burchaklarini toping.
82. Qavariq beshburchakning burchaklari kattaliklari 2:3:4:5:6 kabi nisbatda. Burchaklardan kattasining miqdorini toping.
83. Ko’pburchak ichki burchaklarining va bitta tashqi burchagining yig’indisi 2070° ga teng. Shu ko’pburchakning tomonlari soni nechta?
84. ABCD trapetsiyaning kichik asosi 6 ga teng. Agar ABE uchburchakning (BE‖CD) perimetri 36 ga teng bo’lsa, trapetsiyaning perimetrini toping.
85. Trapetsiyaning uchta tomoni 4 sm dan, to’rtinchi tomoni esa 8 sm. Trapetsiyaning eng katta burchagini toping.
86. ABCD trapetsiyada AC diagonal CD yon tomonga perpendikular. Agar ∠D=72° va AB=BC bo’lsa, ∠ABC=?
87. To’g’ri to’rtburchakning eni 5 ga teng, bo’yi undan 7 ga ortiq. Shu to’g’ri to’rtburchakning perimetrini toping.