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This activity was created by '{$1}'. Do you want to modify the original activity or create your own copy instead?
This activity was created by '{$1}' and you lack the permission to edit it. Do you want to create your own copy instead and add it to the book?
Myndræn sönnun á hornasummu þríhyrnings
Dragðu til punkt eða línu á myndinni og athugaðu hvað gerist.
Getur þú útskýrt hvernig þessi mynd sannar í raun hornasummu þríhyrnings ?
Athugaðu að línurnar E og G eru samsíða.