# IGCSE Mathematics Paper-1: Specimen Questions with Answers 36 - 37 of 175

## Question number: 36

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Essay Question▾

### Describe in Detail

In the diagram, AB is a diameter of the circle, center O. DBE is the tangent at the point B. The line DCA cuts the circle at C. Angle BAC = . Geometrical Image Showing Angle DAB Find the below given angles by using triangular formulas

(a) Write down the size of angle ACB.

(b) Calculate the size of angle CBA.

(c) Calculate the size of angle ADB.

### Explanation

Here,

(a) Angle BAC = is given,

• As we know, the triangle formed by the diameter and the inscribed angle (triangle ABC above) is always a right triangle.
• So, angle ACB =

(b) Now, in triangle ABC,

(c) In triangle ABD,

So,

## Question number: 37

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### Write in Short

The net of a solid is drawn accurately below. Six Squares Making a Solid Find below mentioned names of squares and solid

Write down the special name for

(a) The squares shown on the net,

(b) The solid.

### Explanation

Here,

(a) The squares shown on the net are equal squares, which have equal lengths of edges.

(b) The solid of net image will called as cube.

• A cube is made by four equal squares which have six faces, eight vertices and twelve edges.