281- La somma delle misure della base dell'altezza di un triangolo è 176 cm e la base è i \( 3 / 5 \) dell'altezza. Calcola l'area del triangolo. [3630 \( \mathbf{~ c m} 2] \)

A triangle has a perimeter of 20 and two of its sides measure 7 and 5 . What is the length of the third side?

24) ABC is a triangle in which \( \mathrm{m}(\angle \mathrm{A})=60^{\circ}, \mathrm{b}: \mathrm{c}=5: 8 \) and the area of the circumcircle of the triangle ABC is \( 147 \pi \mathrm{~cm}^{2} \), then the perimeter of \( \triangle \mathrm{ABC}=\ldots \ldots \ldots \cdots \cdot \mathrm{cm} \). \( \begin{array}{llll}\text { (a) } 21 & \text { (b) } 34 & \text { (c) } 54 & \text { (d) } 60\end{array} \)

\( Q(7,10) \). Cari kecerunan bagi persamaan pembahagi dua sama serenjang untuk garis lurus \( P Q \). (TP4) A straight line passes through point \( (P(2,5) \) and point \( Q(7,10) \). Find the gradient of the equation of the perpendicular bisector for the straight line \( \overline{P Q} \) [3 markah / marks \( ] \)

(घ) सिद्ध कीजिए के त्रिभुज कै तीनों अन्त: कोणों का योग \( 180^{\circ} \) होता है

लघु उत्तरीय प्रश्न (Short Answer Type Questions) 6. एक घनाभ का पृष्ठीय क्षेत्रफल 1300 सेमी \( ^{2} \) है। यदि इसकी चौड़ाई 10 सेमी है तथा ऊँचाई 20 सेमी है तो इसकी लम्बाई ज्ञात कीजिए।