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Ffocws dysgu

Dysga ddisgrifio ongl fel un sydd yn fwy neu’n llai nag ongl sgwâr.

Mae'r wers hon yn cynwwys:

• disgrifiad o'r ongl sgwâr
• un gweithgaredd

Learning focus

Learn to describe an angle as more or less than a right angle.

This lesson includes:

• a description of a right angle
• one activity

Beth yw ongl? / What is an angle?

Ongl sy’n mesur tro, a hynny mewn graddau neu °. Mae 360° mewn tro llawn. Gelli di ganfod maint ongl trwy ddefnyddio onglydd.

An angle is a measure of a turn, measured in degrees or °. There are 360° in a full turn. You can find out the size of an angle using a protractor.

Beth yw ongl sgwâr? / What is a right angle?

Mae ongl sgwâr yn ongl sy'n mesur 90° yn union.

A right angle is an angle that measures exactly 90°.

Edrycha ar yr onglau isod. Maen nhw i gyd yn onglau sgwâr.

Look at the angles below. They are all right angles.

Gweithgaredd 1 / Activity 1

Edrycha ar yr onglau isod.

• Mae rhai ohonyn nhw'n onglau sgwâr.
• Mae rhai ohonyn nhw'n fwy nag ongl sgwâr.
• Mae rhai ohonyn nhw'n llai nag ongl sgwâr.

Wyt ti'n gwybod y gwahaniaeth?

Gwna restr ar ddarn o bapur o'r rhai sy'n ongl sgwâr, y rhai sy'n fwy nag ongl sgwâr a'r rhai sy'n llai nag ongl sgwâr.

Look at the angles below.

• Some of them are right angles.
• Some of them are bigger than right angles.
• Some of them are smaller than right angles.

Can you tell the difference?

On a piece of paper, make a list of the angles that are right angles, those that are bigger than right angles and those that are smaller than right angles.

Nodiadau i rieni

Ar ddiwedd y wers, bydd disgyblion yn gallu:

• gwybod bod gwahanol fathau o onglau a gwybod yr enwau
• deall beth yw ongl sgwâr
• gwybod sut i adnabod a chategoreiddio onglau syml

Notes for parents

At the end of the lesson, pupils will be able to:

• know that there are different types of angles and know the names
• understand what a right angle is
• know how to recognise and categorise simple angles