# IGCSE Mathematics Paper-1: Specimen Questions with Answers 134 - 135 of 175

## Question number: 134

Short Answer Question▾

### Write in Short

A square ABCD has two diagonals, O is center. Angle ODA = . Calculate angle OAD.

### Explanation

Here,

As we can see in the figure AC and BD are intersecting lines in square.

Angle ADO = , as we know angle made by intersecting of diagonal is so angle AOD =

Now, in any triangle addition of all angles will give

So, in

.

## Question number: 135

Short Answer Question▾

### Write in Short

In the diagram, and a line LM passing through point D. Angle . Find the angle LDB, CDM and ADL.

### Explanation

Here, and a line LM passing through point D.

Now, Angle is given.

- So, angles BDM and ADL are
**vertical angles**as shown in figure, which will be always same.

So, angle

- Now, angles BDM and CDM are complimentary angles, as shown in figure.
- Two angles whose adding gives are called as
**complimentary angles**.

So,

Now, , so **. **

So,

**Thus, angle **

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