Question

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STD 10TH...
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1-Find the value of sin²30+cos²45°.
2-The radius of a circle with centre P is 25cm.The length of a chord of this circle is 48cm.Find the distance of the chord from the centre P of the circle.
3-Write an equation of the line parallel to Y-axis at a distance of 7 units from it to its left.
4-In ΔPQR,PQ=10cm,QR=12cm,PR=8cm.Find out the greatest and the smallest angle of the triangle.Justify.
5-If cot tita=40/9,find the values of cosec tita and sin tita.
6-In a right angled ΔBAC,∠BAC=90°,segments AD,BE and CF are the medians.
Prove that 2(AD²+BE²+CF²)=3BC².

Answer 1

Answer:

Step-by-step

Q1.

$sin^{2}30  + cos^{2}45$

=(1/2)^2 + (1/root2)^2

=1/4 + 1/2

=3/4

Q3.

x=-7

Q4.

the largest angle will be P as it is opposite to the largest side.

the smallest angle will be Q as it is opposite to the smallest side