280- Calcola l'area di un triangolo sape do che la base misura 49 cm ed è i 7 dell'altezza. [857,5 cm

Dado un cilindro con un radio de 4 cm, ¿cuál debe ser la altura para que el volumen sea \( 64\pi \) cm³?

काम का पृष्ठीय क्षेत्रफल 1300 सेमी \( ^{2} \) है। यदि इसकी चौड़ाई 10 सें को 20 सेमी है तो इसकी लम्बाई ज्ञात कीजिए।

3 The area of a triangle is \( 10 \mathrm{~cm}^{2} \). If the base of the triangle were increased by \( 10 \% \) and the height of the triangle were decreased by \( 10 \% \), what would be the area of the new resulting triangle?

Find the condition at which the line \( l x+m y+n=0 \) touches the circle \( x^{2}+y^{2}+28 x+2 f y+c=0 \) For what value of \( n \), a. the line \( 3 x+4 y+n=0 \) touches the circle \( x^{2}+y^{2}-4 x-6 y-12-02 \)

\( Q(7,10) \). 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 \( ] \)