Câu 3. Tam giác \( A B C \) có \( A B=3, A C=6, \widehat{B A C}=60^{\circ} \). A) \( B C^{2}=A B^{2}+A C^{2}-2 A B \cdot A C \cdot \cos A \) b) Độ dài cạnh \( B C \) bằng \( 3 \sqrt{3} \). c) Bán kính đường tròn ngoaại tiếp tam giác \( A B C \) là \( R=2 \). \( S \) d) Diện tích tam giác \( A B C \) bằng \( 9 \sqrt{3} \).

एउटा ज्यामितीय श्रेणीको पहिला तीन पदहरू \( 2 p, 2 p+3 \) र \( 2 p+9 \) भए, \( 2 p, 2 p+3 \) and \( 2 p+9 \) are the first three terms of a geometric series. (i) \( p \) को मान पत्ता लगाउनुहोस् । (Find the value of \( p \).) (ii) पहिलो पद पत्ता लगाउनुहोस् । (Find the first term.) (iii) पाँचौं पदको मान निकाल्नुहोस् । (Find the value of fifth term.)

In a right triangle, if one angle measures 30 degrees, what is the measure of the other non-right angle?

The area of a trapezium is 34 cm 2 and the length of one of the parallel sides is 10 cm and ight is 4 cm . Find the length of the other parallel side.

If a sphere has a radius of 5 cm, what is its surface area? Use \( S = 4\pi r^{2} \).

What results when a plane is parallel to the axis of a double-napped cone and passes through the vertex? point parabola two intersecting lines a single line